<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style media="screen">
        div.semi-circle{height:100px; width:50px; background;#9da; border-radius:50px 0 0 50px; border:1px solid #ccc;}
    </style>
</head>
<body>
    <div class="semi-circle"></div>
</body>
</html>
